CVE-2025-12205: kamailio Buffer Overflow — Exploit

Description

A vulnerability was detected in Kamailio 5.5. The affected element is the function sr_push_yy_state of the file src/core/cfg.lex of the component Configuration File Handler. The manipulation results in use after free. The attack must be initiated from a local position. The exploit is now public and may be used. The real existence of this vulnerability is still doubted at the moment. This attack requires manipulating config files which might not be a realistic scenario in many cases. The vendor was contacted early about this disclosure but did not respond in any way.

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CVSS v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Weakness Type (CWE)

CWE-119 Buffer Overflow

CWE-416 Use After Free

Affected Products

Vendor	Product	Versions
kamailio	kamailio	All

References

Exploits

https://shimo.im/docs/ZzkLMVMLOzIRlpAQ/

Other References

https://vuldb.com/?ctiid.329875 https://vuldb.com/?id.329875 https://vuldb.com/?submit.673225 https://www.openwall.com/lists/oss-security/2025/11/02/3 http://www.openwall.com/lists/oss-security/2025/10/27/12 http://www.openwall.com/lists/oss-security/2025/10/27/8 https://www.openwall.com/lists/oss-security/2025/10/27/8

Frequently Asked Questions

What is CVE-2025-12205? +

A vulnerability was detected in Kamailio 5.5. The affected element is the function sr_push_yy_state of the file src/core/cfg.lex of the component Configuration File Handler. The manipulation results in use after free. The attack must be initiated from a local position. The exploit is now public and may be used. The real existence of this vulnerability is still doubted at the moment. This attack requires manipulating config files which might not be a realistic scenario in many cases. The vendor was contacted early about this disclosure but did not respond in any way. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2025-12205? +

CVE-2025-12205 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-12205? +

CVE-2025-12205 affects products from kamailio, specifically: kamailio. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-12205? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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